Hi Michael, On 2016/3/24 21:47, Michael Ulbrich wrote: > Hi Joseph, > > thanks for this information although this does not sound too optimistic ... > > So, if I understand you correctly, if we had a metadata backup from > o2image _before_ the crash we could have looked up the missing info to > remove the loop from group chain 73, right? If we have metadata backup, we can use o2image to restore it back, but this may loss some data.
> > But how could the loop issue be fixed and at the same time the damage to > the data be minimized? There is a recent file level backup from which > damaged or missing files could be restored later. > > 151 4054438912 15872 2152 13720 10606 1984 > 152 4094595072 15872 10753 5119 5119 1984 > 153 4090944512 15872 1818 14054 9646 1984 <-- > 154 4083643392 15872 571 15301 4914 1984 > 155 4510758912 15872 4834 11038 6601 1984 > 156 4492506112 15872 6532 9340 5119 1984 > > Could you describe a "brute force" way how to dd out and edit record > #153 to remove the loop and minimize potential loss of data at the same > time? So that fsck would have a chance to complete and fix the remaining > issues? This is dangerous until we can know exactly what's info the block should store. My idea is to find out the actual block of record #154 and let block 4090944512 of record #153 points to it. This must be a bit complicated and should be done under deep understanding of the disk layout. I have went though fsck.ocfs2 patches, and found the following may help: commit efca4b0f2241 (Break a chain loop in group desc) But as you said, you have already upgraded to version 1.8.4. So I'm sorry currently I don't have a better idea. Thanks, Joseph > > Thanks a lot for your help ... Michael > > On 03/24/2016 02:10 PM, Joseph Qi wrote: >> Hi Michael, >> So I think the block of record #153 goes wrong, which points next to >> block 4083643392 of record #19. >> But the problem is we don't know the right info of the block of record >> #153, otherwise we can dd out, edit it and then dd in to fix it. >> >> Thanks, >> Joseph >> >> On 2016/3/24 18:38, Michael Ulbrich wrote: >>> Hi Joseph, >>> >>> ok, got it! Here's the loop in chain 73: >>> >>> Group Chain: 73 Parent Inode: 13 Generation: 1172963971 >>> CRC32: 00000000 ECC: 0000 >>> ## Block# Total Used Free Contig Size >>> 0 4280773632 15872 11487 4385 1774 1984 >>> 1 2583263232 15872 5341 10531 5153 1984 >>> 2 4543613952 15872 5329 10543 5119 1984 >>> 3 4532662272 15872 10753 5119 5119 1984 >>> 4 4539963392 15872 3223 12649 7530 1984 >>> 5 4536312832 15872 5219 10653 5534 1984 >>> 6 4529011712 15872 6047 9825 3359 1984 >>> 7 4525361152 15872 4475 11397 5809 1984 >>> 8 4521710592 15872 3182 12690 5844 1984 >>> 9 4518060032 15872 5881 9991 5131 1984 >>> 10 4236966912 15872 10753 5119 5119 1984 >>> 11 4098245632 15872 10756 5116 3388 1984 >>> 12 4514409472 15872 8826 7046 5119 1984 >>> 13 3441144832 15872 15 15857 9680 1984 >>> 14 4404892672 15872 7563 8309 5119 1984 >>> 15 4233316352 15872 9398 6474 5114 1984 >>> 16 4488855552 15872 6358 9514 5119 1984 >>> 17 3901115392 15872 9932 5940 3757 1984 >>> 18 4507108352 15872 6557 9315 6166 1984 >>> 19 4083643392 15872 571 15301 4914 1984 <-- >>> 20 4510758912 15872 4834 11038 6601 1984 >>> 21 4492506112 15872 6532 9340 5119 1984 >>> 22 4496156672 15872 10753 5119 5119 1984 >>> 23 4503457792 15872 10718 5154 5119 1984 >>> ... >>> 154 4083643392 15872 571 15301 4914 1984 <-- >>> 155 4510758912 15872 4834 11038 6601 1984 >>> 156 4492506112 15872 6532 9340 5119 1984 >>> 157 4496156672 15872 10753 5119 5119 1984 >>> 158 4503457792 15872 10718 5154 5119 1984 >>> ... >>> 289 4083643392 15872 571 15301 4914 1984 <-- >>> 290 4510758912 15872 4834 11038 6601 1984 >>> 291 4492506112 15872 6532 9340 5119 1984 >>> 292 4496156672 15872 10753 5119 5119 1984 >>> 293 4503457792 15872 10718 5154 5119 1984 >>> >>> etc. >>> >>> So the loop begins at record #154 and spans 135 records, right? >>> >>> Will backup fs metadata as soon as I have some external storage at hand. >>> >>> Thanks a lot so far ... Michael >>> >>> On 03/24/2016 10:41 AM, Joseph Qi wrote: >>>> Hi Michael, >>>> It seems that dead loop happens in chain 73. You have formatted using 2K >>>> block and 4K cluster, so each chain should have 1522 or 1521 records. >>>> But at first glance, I cannot figure out which block goes wrong, because >>>> the output you pasted indicates all blocks are different. So I suggest >>>> you investigate the all blocks which belong to chain 73 and try to find >>>> out if there is a loop there. >>>> BTW, have you backed up the metadata using o2image? >>>> >>>> Thanks, >>>> Joseph >>>> >>>> On 2016/3/24 16:40, Michael Ulbrich wrote: >>>>> Hi Joseph, >>>>> >>>>> thanks a lot for your help. It is very much appreciated! >>>>> >>>>> I ran debugsfs.ocfs2 from ocfs2-tools 1.6.4 on the mounted file system: >>>>> >>>>> root@s1a:~# debugfs.ocfs2 -R 'stat //global_bitmap' /dev/drbd1 > >>>>> debugfs_drbd1.log 2>&1 >>>>> >>>>> Inode: 13 Mode: 0644 Generation: 1172963971 (0x45ea0283) >>>>> FS Generation: 1172963971 (0x45ea0283) >>>>> CRC32: 00000000 ECC: 0000 >>>>> Type: Regular Attr: 0x0 Flags: Valid System Allocbitmap Chain >>>>> Dynamic Features: (0x0) >>>>> User: 0 (root) Group: 0 (root) Size: 11381315956736 >>>>> Links: 1 Clusters: 2778641591 >>>>> ctime: 0x54010183 -- Sat Aug 30 00:41:07 2014 >>>>> atime: 0x54010183 -- Sat Aug 30 00:41:07 2014 >>>>> mtime: 0x54010183 -- Sat Aug 30 00:41:07 2014 >>>>> dtime: 0x0 -- Thu Jan 1 01:00:00 1970 >>>>> ctime_nsec: 0x00000000 -- 0 >>>>> atime_nsec: 0x00000000 -- 0 >>>>> mtime_nsec: 0x00000000 -- 0 >>>>> Refcount Block: 0 >>>>> Last Extblk: 0 Orphan Slot: 0 >>>>> Sub Alloc Slot: Global Sub Alloc Bit: 7 >>>>> Bitmap Total: 2778641591 Used: 1083108631 Free: 1695532960 >>>>> Clusters per Group: 15872 Bits per Cluster: 1 >>>>> Count: 115 Next Free Rec: 115 >>>>> ## Total Used Free Block# >>>>> 0 24173056 9429318 14743738 4533995520 >>>>> 1 24173056 9421663 14751393 4548629504 >>>>> 2 24173056 9432421 14740635 4588817408 >>>>> 3 24173056 9427533 14745523 4548692992 >>>>> 4 24173056 9433978 14739078 4508568576 >>>>> 5 24173056 9436974 14736082 4636369920 >>>>> 6 24173056 9428411 14744645 4563390464 >>>>> 7 24173056 9426950 14746106 4479459328 >>>>> 8 24173056 9428099 14744957 4548851712 >>>>> 9 24173056 9431794 14741262 4585389056 >>>>> ... >>>>> 105 24157184 9414241 14742943 4690652160 >>>>> 106 24157184 9419715 14737469 4467999744 >>>>> 107 24157184 9411479 14745705 4431525888 >>>>> 108 24157184 9413235 14743949 4559327232 >>>>> 109 24157184 9417948 14739236 4500950016 >>>>> 110 24157184 9411013 14746171 4566691840 >>>>> 111 24157184 9421252 14735932 4522916864 >>>>> 112 24157184 9416726 14740458 4537550848 >>>>> 113 24157184 9415358 14741826 4676303872 >>>>> 114 24157184 9420448 14736736 4526662656 >>>>> >>>>> Group Chain: 0 Parent Inode: 13 Generation: 1172963971 >>>>> CRC32: 00000000 ECC: 0000 >>>>> ## Block# Total Used Free Contig Size >>>>> 0 4533995520 15872 6339 9533 3987 1984 >>>>> 1 4530344960 15872 10755 5117 5117 1984 >>>>> 2 2997109760 15872 10753 5119 5119 1984 >>>>> 3 4526694400 15872 10753 5119 5119 1984 >>>>> 4 3022663680 15872 10753 5119 5119 1984 >>>>> 5 4512092160 15872 9043 6829 2742 1984 >>>>> 6 4523043840 15872 4948 10924 9612 1984 >>>>> 7 4519393280 15872 6150 9722 5595 1984 >>>>> 8 4515742720 15872 4323 11549 6603 1984 >>>>> 9 3771028480 15872 10753 5119 5119 1984 >>>>> ... >>>>> 1513 5523297280 15872 1 15871 15871 1984 >>>>> 1514 5526947840 15872 1 15871 15871 1984 >>>>> 1515 5530598400 15872 1 15871 15871 1984 >>>>> 1516 5534248960 15872 1 15871 15871 1984 >>>>> 1517 5537899520 15872 1 15871 15871 1984 >>>>> 1518 5541550080 15872 1 15871 15871 1984 >>>>> 1519 5545200640 15872 1 15871 15871 1984 >>>>> 1520 5548851200 15872 1 15871 15871 1984 >>>>> 1521 5552501760 15872 1 15871 15871 1984 >>>>> 1522 5556152320 15872 1 15871 15871 1984 >>>>> >>>>> Group Chain: 1 Parent Inode: 13 Generation: 1172963971 >>>>> CRC32: 00000000 ECC: 0000 >>>>> ## Block# Total Used Free Contig Size >>>>> 0 4548629504 15872 10755 5117 2496 1984 >>>>> 1 2993490944 15872 59 15813 14451 1984 >>>>> 2 2489713664 15872 10758 5114 3726 1984 >>>>> 3 3117609984 15872 3958 11914 6165 1984 >>>>> 4 2544472064 15872 10753 5119 5119 1984 >>>>> 5 3040948224 15872 10753 5119 5119 1984 >>>>> 6 2971587584 15872 10753 5119 5119 1984 >>>>> 7 4493871104 15872 8664 7208 3705 1984 >>>>> 8 4544978944 15872 8711 7161 2919 1984 >>>>> 9 4417209344 15872 3253 12619 6447 1984 >>>>> ... >>>>> 1513 5523329024 15872 1 15871 15871 1984 >>>>> 1514 5526979584 15872 1 15871 15871 1984 >>>>> 1515 5530630144 15872 1 15871 15871 1984 >>>>> 1516 5534280704 15872 1 15871 15871 1984 >>>>> 1517 5537931264 15872 1 15871 15871 1984 >>>>> 1518 5541581824 15872 1 15871 15871 1984 >>>>> 1519 5545232384 15872 1 15871 15871 1984 >>>>> 1520 5548882944 15872 1 15871 15871 1984 >>>>> 1521 5552533504 15872 1 15871 15871 1984 >>>>> 1522 5556184064 15872 1 15871 15871 1984 >>>>> >>>>> ... all following group chains are similarly structured up to #73 which >>>>> looks as follows: >>>>> >>>>> Group Chain: 73 Parent Inode: 13 Generation: 1172963971 >>>>> CRC32: 00000000 ECC: 0000 >>>>> ## Block# Total Used Free Contig Size >>>>> 0 2583263232 15872 5341 10531 5153 1984 >>>>> 1 4543613952 15872 5329 10543 5119 1984 >>>>> 2 4532662272 15872 10753 5119 5119 1984 >>>>> 3 4539963392 15872 3223 12649 7530 1984 >>>>> 4 4536312832 15872 5219 10653 5534 1984 >>>>> 5 4529011712 15872 6047 9825 3359 1984 >>>>> 6 4525361152 15872 4475 11397 5809 1984 >>>>> 7 4521710592 15872 3182 12690 5844 1984 >>>>> 8 4518060032 15872 5881 9991 5131 1984 >>>>> 9 4236966912 15872 10753 5119 5119 1984 >>>>> ... >>>>> 2059651 4299026432 15872 4334 11538 4816 1984 >>>>> 2059652 4087293952 15872 7003 8869 2166 1984 >>>>> 2059653 4295375872 15872 6626 9246 5119 1984 >>>>> 2059654 4288074752 15872 509 15363 9662 1984 >>>>> 2059655 4291725312 15872 6151 9721 5119 1984 >>>>> 2059656 4284424192 15872 10052 5820 5119 1984 >>>>> 2059657 4277123072 15872 7383 8489 5120 1984 >>>>> 2059658 4273472512 15872 14 15858 5655 1984 >>>>> 2059659 4269821952 15872 2637 13235 7060 1984 >>>>> 2059660 4266171392 15872 10758 5114 3674 1984 >>>>> ... >>>>> >>>>> Assuming this would go on forever I stopped debugfs.ocfs2. >>>>> >>>>> With debugs.ocfs2 from ocfs2-tools 1.8.4 I get an identical result. >>>>> >>>>> Please let me know if I can provide any further information and help to >>>>> fix this issue. >>>>> >>>>> Thanks again + Best regards ... Michael >>>>> >>>>> On 03/24/2016 01:30 AM, Joseph Qi wrote: >>>>>> Hi Michael, >>>>>> Could you please use debugfs to check the output? >>>>>> # debugfs.ocfs2 -R 'stat //global_bitmap' <device> >>>>>> >>>>>> Thanks, >>>>>> Joseph >>>>>> >>>>>> On 2016/3/24 6:38, Michael Ulbrich wrote: >>>>>>> Hi ocfs2-users, >>>>>>> >>>>>>> my first post to this list from yesterday probably didn't get through. >>>>>>> >>>>>>> Anyway, I've made some progress in the meantime and may now ask more >>>>>>> specific questions ... >>>>>>> >>>>>>> I'm having issues with an 11 TB ocfs2 shared filesystem on Debian >>>>>>> Wheezy: >>>>>>> >>>>>>> Linux s1a 3.2.0-4-amd64 #1 SMP Debian 3.2.54-2 x86_64 GNU/Linux >>>>>>> >>>>>>> the kernel modules are: >>>>>>> >>>>>>> modinfo ocfs2 -> version: 1.5.0 >>>>>>> >>>>>>> using stock ocfs2-tools 1.6.4-1+deb7u1 from the distri. >>>>>>> >>>>>>> As an alternative I cloned and built the latest ocfs2-tools from >>>>>>> markfasheh's ocfs2-tools on github which should be version 1.8.4. >>>>>>> >>>>>>> The filesystem runs on top of drbd, is used to roughly 40 % and suffers >>>>>>> from read-only remounts and hanging clients since the last reboot. This >>>>>>> may be DLM problems but I suspect they stem from some corrupt disk >>>>>>> structures. Before that it all ran stable for months. >>>>>>> >>>>>>> This situation made me want to run fsck.ocfs2 and now I wonder how to do >>>>>>> that. The filesystem is not mounted. >>>>>>> >>>>>>> With the stock ocfs-tools 1.6.4: >>>>>>> >>>>>>> root@s1a:~# fsck.ocfs2 -v -f /dev/drbd1 > fsck_drbd1.log 2>&1 >>>>>>> fsck.ocfs2 1.6.4 >>>>>>> Checking OCFS2 filesystem in /dev/drbd1: >>>>>>> Label: ocfs2_ASSET >>>>>>> UUID: 6A1A0189A3F94E32B6B9A526DF9060F3 >>>>>>> Number of blocks: 5557283182 >>>>>>> Block size: 2048 >>>>>>> Number of clusters: 2778641591 >>>>>>> Cluster size: 4096 >>>>>>> Number of slots: 16 >>>>>>> >>>>>>> I'm checking fsck_drbd1.log and find that it is making progress in >>>>>>> >>>>>>> Pass 0a: Checking cluster allocation chains >>>>>>> >>>>>>> until it reaches "chain 73" and goes into an infinite loop filling the >>>>>>> logfile with breathtaking speed. >>>>>>> >>>>>>> With the newly built ocfs-tools 1.8.4 I get: >>>>>>> >>>>>>> root@s1a:~# fsck.ocfs2 -v -f /dev/drbd1 > fsck_drbd1.log 2>&1 >>>>>>> fsck.ocfs2 1.8.4 >>>>>>> Checking OCFS2 filesystem in /dev/drbd1: >>>>>>> Label: ocfs2_ASSET >>>>>>> UUID: 6A1A0189A3F94E32B6B9A526DF9060F3 >>>>>>> Number of blocks: 5557283182 >>>>>>> Block size: 2048 >>>>>>> Number of clusters: 2778641591 >>>>>>> Cluster size: 4096 >>>>>>> Number of slots: 16 >>>>>>> >>>>>>> Again watching the verbose output in fsck_drbd1.log I find that this >>>>>>> time it proceeds up to >>>>>>> >>>>>>> Pass 0a: Checking cluster allocation chains >>>>>>> o2fsck_pass0:1360 | found inode alloc 13 at block 13 >>>>>>> >>>>>>> and stays there without any further progress. I've terminated this >>>>>>> process after waiting for more than an hour. >>>>>>> >>>>>>> Now - I'm lost somehow ... and would very much appreciate if anybody on >>>>>>> this list would share his knowledge and give me a hint what to do next. >>>>>>> >>>>>>> What could be done to get this file system checked and repaired? Am I >>>>>>> missing something important or do I just have to wait a little bit >>>>>>> longer? Is there a version of ocfs2-tools / fsck.ocfs2 which will >>>>>>> perform as expected? >>>>>>> >>>>>>> I'm prepared to upgrade the kernel to 3.16.0-0.bpo.4-amd64 but shy away >>>>>>> from taking that risk without any clue of whether that might solve my >>>>>>> problem ... >>>>>>> >>>>>>> Thanks in advance ... Michael Ulbrich >>>>>>> >>>>>>> _______________________________________________ >>>>>>> Ocfs2-users mailing list >>>>>>> Ocfs2-users@oss.oracle.com >>>>>>> https://oss.oracle.com/mailman/listinfo/ocfs2-users >>>>>>> >>>>>>> >>>>>> >>>>>> >>>>>> >>>>>> _______________________________________________ >>>>>> Ocfs2-users mailing list >>>>>> Ocfs2-users@oss.oracle.com >>>>>> https://oss.oracle.com/mailman/listinfo/ocfs2-users >>>>>> >>>>> >>>>> _______________________________________________ >>>>> Ocfs2-users mailing list >>>>> Ocfs2-users@oss.oracle.com >>>>> https://oss.oracle.com/mailman/listinfo/ocfs2-users >>>>> >>>>> . >>>>> >>>> >>>> >>> >>> . >>> >> >> > > . > _______________________________________________ Ocfs2-users mailing list Ocfs2-users@oss.oracle.com https://oss.oracle.com/mailman/listinfo/ocfs2-users